{"id":"f2e686f0-e3f0-4260-880a-e54462185e33","shortId":"CFTCCk","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/wire/38` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge confirms it is live, requiring up to 20,000 base units of USDC (i.e., $0.02) per call, settled to a Base address. No API keys, rate limits, or subscriptions are needed — each request is paid individually via the X-PAYMENT header.\n\nThe broader platform advertises multiple API categories including Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point.\n\nHowever, the specific functionality behind `/api/v1/wire/38` is not documented beyond the label \"Premium API Access.\" There is no OpenAPI spec, no request/response schema, and the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. Without documentation or example payloads, the actual behavior of this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The label 'Premium API Access' does not describe what the endpoint actually does","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no useful content","Request and response formats are entirely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/38","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/wire/38","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The x402 challenge is live and confirms pricing and network, but there is zero documentation for this specific endpoint — no OpenAPI spec, no request/response schema, no examples. The docs pages render only a wallet-connect prompt. The actual functionality behind '/api/v1/wire/38' is completely 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'/request':12,28,163 '0.02':11,27,86,162 '000':80 '20':79 'Base network API' 'USDC API' 'accept':48,66 'access':64,180 'actual':213 'address':93 'advertis':117 'ai':129 'analysi':133 'analyt':123 'api':5,14,21,30,40,63,95,119,179,194 'base':8,24,53,81,92 'behavior':214 'behind':170 'beyond':175 'broader':115 'call':4,20,88 'categori':120 'challeng':71 'classif':136 'confirm':72 'connect':200 'content':206 'convers':153 'data':122,126 'doc':191 'document':174,208 'embed':137 'endpoint':57,156,217 'estim':147 'exampl':210 'exchang':142 'export':127 'feed':141 'financ':138 'function':169 'gas':146 'generat':154 'geocod':151 'header':113 'howev':166 'i.e':85 'includ':121 'individu':107 'infrastructur':149 'insight':128 'key':15,31,96 'label':177 'learn':131 'limit':98 'list':60,158 'live':75 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':130 'metric':124 'micropayment API' 'multipl':118 'need':102 'network':54 'no-api-key' 'openapi':184 'page':195 'paid':106 'pay':2,18,37 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':36 'payload':211 'payment':50,112 'per':3,19,38,87 'platform':6,22,41,116 'point':165 'post':67 'post-endpoint' 'premium':62,178 'premium API access' 'price':140,164,192 'prompt':202 'protocol':46 'quot':145 'rate':97,143 'render':197 'report':125 'request':39,68,104 'request/response':187 'requir':16,32,76 'schema':188 'sentiment':132 'settl':89 'spec':185 'specif':56,168 'subscript':100 'summar':135 'text':134 'token':144 'unit':82 'unknown':219 'usdc':49,84 'usdc-base' 'use':43 'util':150 'valid':152 'via':9,25,108 'wallet':201 'web3':139 'without':207 'x':111 'x-payment':110 'x402':10,26,45,70 'x402 API' 'x402-payment'","prices":[{"id":"5a90fc0b-f2d8-455d-9f66-d538f2ca897b","listingId":"f2e686f0-e3f0-4260-880a-e54462185e33","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/wire/38","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:04.700Z"}],"sources":[{"listingId":"f2e686f0-e3f0-4260-880a-e54462185e33","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/38","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:04.700Z","lastSeenAt":"2026-04-22T18:04:39.738Z"}],"details":{"listingId":"f2e686f0-e3f0-4260-880a-e54462185e33","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/38 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge requiring up to 20,000 base units of USDC on Base ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/wire/38"},{"claim":"The platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a pay-per-call API without needing API key registration","Agent-driven workflows that settle per-request costs in USDC on Base","Testing x402 protocol integrations against a live endpoint"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents with x402 payment capability on Base","Prototyping x402 payment flows"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Anyone without USDC on the Base network","High-volume use cases where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:30.355Z"},"updatedAt":"2026-04-22T18:04:39.738Z"}}